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Nano Research https://doi.org/10.1007/s12274-024-6664-8
Research Article | Online first | Published: 02 May 2024

Temperature-dependent self-trapped exciton emission in Cu(I) doped zinc-based metal halides from well-resolved excited state structures

Show Author's Information Yunlong Bai,  Shuai Zhang,  Nengneng Luo,  Bingsuo Zou,  Ruosheng Zeng( )
State Key Laboratory of Featured Metal Materials and Life-cycle Safety for Composite Structures, School of Physical Science and Technology, Guangxi University, Nanning 530004, China
Keywords:
self-trapped exciton, temperature sensor, sky-blue emission, metal halides, excited state structures
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Bai Y, Zhang S, Luo N, et al. Temperature-dependent self-trapped exciton emission in Cu(I) doped zinc-based metal halides from well-resolved excited state structures. Nano Research, 2024, https://doi.org/10.1007/s12274-024-6664-8
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Abstract Full text Electronic supplementary material About this article

Zero-dimensional metal halides are of unique structures and tunable photoluminescence properties, showing great potential applications such as light-emitting diodes (LEDs) and sensing. Herein, we successfully synthesized Cu+ doped (MA)2ZnCl4 metal halides by a slow evaporation solvent method. The introduction of Cu+ results in sky-blue self-trapped exciton emission in (MA)2ZnCl4 at 486 nm at room temperature, and a photoluminescence quantum yield is as high as 54.9%. Interestingly, at low temperatures, Cu+-doped (MA)2ZnCl4 exhibits two emission peaks located at 482 and 605 nm, respectively. This temperature-dependent dual emission indicates two excited state structures that exist on the triplet excited-state potential energy surface. In addition, the temperature sensor we fitted has good performance (Sr = 1.65 %·K−1), which is the first attempt in Cu+ doped Zn-based metal halides. Our work enriches the family of sky-blue metal halides and provides a promising strategy for building sky-blue LEDs.


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About this article

Temperature-dependent self-trapped exciton emission in Cu(I) doped zinc-based metal halides from well-resolved excited state structures

Show Author's information Yunlong Bai, Shuai Zhang, Nengneng Luo, Bingsuo Zou, Ruosheng Zeng( )
State Key Laboratory of Featured Metal Materials and Life-cycle Safety for Composite Structures, School of Physical Science and Technology, Guangxi University, Nanning 530004, China

Abstract

Zero-dimensional metal halides are of unique structures and tunable photoluminescence properties, showing great potential applications such as light-emitting diodes (LEDs) and sensing. Herein, we successfully synthesized Cu+ doped (MA)2ZnCl4 metal halides by a slow evaporation solvent method. The introduction of Cu+ results in sky-blue self-trapped exciton emission in (MA)2ZnCl4 at 486 nm at room temperature, and a photoluminescence quantum yield is as high as 54.9%. Interestingly, at low temperatures, Cu+-doped (MA)2ZnCl4 exhibits two emission peaks located at 482 and 605 nm, respectively. This temperature-dependent dual emission indicates two excited state structures that exist on the triplet excited-state potential energy surface. In addition, the temperature sensor we fitted has good performance (Sr = 1.65 %·K−1), which is the first attempt in Cu+ doped Zn-based metal halides. Our work enriches the family of sky-blue metal halides and provides a promising strategy for building sky-blue LEDs.

Keywords: self-trapped exciton, temperature sensor, sky-blue emission, metal halides, excited state structures

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Publication history
Copyright
Acknowledgements

Publication history

Received: 25 February 2024
Revised: 22 March 2024
Accepted: 26 March 2024
Published: 02 May 2024

Copyright

© Tsinghua University Press 2024

Acknowledgements

Acknowledgements

This work was supported by the National Natural Science Foundation of China (Nos. 22175043 and 52162021) and Guangxi Science and Technology Plan Project (No. Guike AA23073018). The calculation was supported by the high-performance computing platform of Guangxi University.

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